CVE-2026-58534
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedHeap-based buffer overflow in Microsoft Input Method Editor (IME) allows an authorized attacker to elevate privileges locally.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceHeap-based buffer overflow in Microsoft Input Method Editor (IME) enables a locally authenticated attacker to execute code with elevated (likely SYSTEM) privileges. The vulnerability stems from improper bounds checking in IME when processing input, allowing heap memory corruption to achieve privilege escalation.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 10.0.14393.9339< 10.0.17763.9020< 10.0.19044.7548< 10.0.19045.7548< 10.0.26100.8875< 10.0.26200.8875< 10.0.28000.2525< 10.0.14393.9339CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Windows version numberOpen Command Prompt or PowerShell and run 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to obtain the exact Windows build numberAffected if The build number falls below any of these thresholds: 14393.9339 (Windows 10 1607/Server 2016), 17763.9020 (Windows 10 1809), 19044.7548 (Windows 10 21h2), 19045.7548 (Windows 10 22h2), 26100.8875 (Windows 11 24h2), 26200.8875 (Windows 11 25h2), or 28000.2525 (Windows 11 26h1)
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Confirm IME component is installedCheck for the presence of IME by navigating to Control Panel > Language or by running 'Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' to look for IME-related processes, or check for IME DLL files in System32 (such as ime*.dll or msime*.exe)Affected if Input Method Editor (IME) is installed on the system; IME is commonly present when Asian language input methods are enabled or when language packs are installed
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Identify if IME is actively loadedOpen Task Manager, go to the Processes or Details tab, and look for running IME-related processes (such as IME processes named 'Input Method Manager' or specific IME executables like 'msime.exe', 'IMEAPI.exe', or similar)Affected if Any IME process is currently running under a user session, as the vulnerability triggers when IME processes user input
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Verify current user contextRun 'whoami /all' in Command Prompt to confirm the current user account and privilegesAffected if The current user has local authentication access to the system; this is a local privilege escalation vulnerability requiring an attacker to have an authenticated session on the affected machine
You are affected if your Windows build number is below the specified thresholds AND IME is installed and potentially running on your system.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data10.0.14393.933910.0.17763.902010.0.19044.7548
Apply Microsoft security updates for IME through Windows Update or enterprise patch management systems; prioritize patching on systems with privileged users or exposed attack surfaces.
- Consultation8.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,304.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-58534 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-58534 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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